I'm aware that Beamng Drive supports only one terrain, but is it okay to use other terrains as a background? I mean if there won't be any bugs like terrains height mixing up or collision model switching between main terrain and background terrain (aka. main terrain becomes ghost) ?
No it is not possible for beamng to support multiple Terrains atm. It might become a feature in the future but no one knows for sure tho.
Well I tried adding second terrain object. At first it was okay. Main terrain had collisions and background was ghost, but after reloading the map the background had collisions and main became ghost. Does anyone have an idea how to manually select collidable terrain? (If nothing works i will delete additional terrain but I desperatelly need background)
I suspect there's likely to be some logic to which terrain gets collision (whichever appears first in the .mis file or something), but you'd probably be safer and all around better of using a non-colliding mesh for the background.
Yes, exactly like this! I tried this and terrain that is first in alphabetical order gets the collisions. However I need to test this more to check how stable this is. Thank you
You can make a background image or object in blender.. Or photoshop idk. Import it to the game scale it up so if fits your map done